I was sitting and chatting with neighbor when I seen what I thought was a helicopter coming toward me on the horizon. I said to neighbor, here comes a helicopter. All I could see was just a round sphere. As I continued watching and waiting for sound I realized there was no sound, rotors or anything else; just a perfectly round ball. It passed overhead at about 120 degrees angle from the horizon. There was no sound, no protrusions of any kind. No lights or any kind of visible means of propulsion or power. Had I not been looking at the horizon just when I did and seen it coming, I would never have known it passed overhead. I would estimate it's speed as 200/300 miles per hour at about 1000 feet altitude. It was about 50/60 feet in diameter, and air force blue grey in color. The only thing I could see by way of markings was what appeared to be welding beads like where sections of plating were welded together. I could see it's front, bottom,side and rear as it passed overhead.